onychomycosis on·y·cho·my·co·sis (ŏn’ĭ-kō-mī-kō’sĭs) n. A fungal infection of the fingernails or toenails that results in thickening, roughness, and splitting of the nails. It is usually caused by Trichophyton rubrum or T. mentagrophytes. Also called tinea unguium.

onychoosteodysplasia on·y·cho·os·te·o·dys·pla·sia (ŏn’ĭ-kō-ŏs’tē-ō-dĭs-plā’zhə, -zhē-ə) n. A hereditary skeletal disorder characterized by defects in the nails, hypoplasia of the patella and iliac horns, and renal abnormalities. Also called nail-patella syndrome.

onychopathy on·y·chop·a·thy (ŏn’ĭ-kŏp’ə-thē) n. A disease of the fingernails or toenails. Also called onychosis. on’y·cho·path’ic (-kō-pāth’ĭk) adj.

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